Bonanza Mountain Estates is an unincorporated community and a census-designated place (CDP) located in Boulder County, Colorado, United States.

The population of the Bonanza Mountain Estates CDP was 127 at the United States Census 2020.

[5] The CDP is a residential community located in southern Boulder County in the Front Range of the Colorado Rocky Mountains, just east of the town of Nederland.

Ridge Road is the main street through the community, leading west to Nederland and east to St. Ann Highlands.

At the 2020 United States Census, the Bonanza Mountain Estates CDP had an area of 108 acres (0.436 km2), all land.